The ancient Linux permission system is often insufficient for complex production environments. Access Control Lists offer a flexible alternative.
Alice appreciates the convenience of a PC-based electronic calendar, but to maintain her privacy, she has set strict permissions for her calendar file: She can add new appointments herself, but other members of her workgroup have read-only access. Others outside of her workgroup are not even allowed to look.
This configuration is fine at first, but one day Bob from another department agrees to collaborate with Alice. To allow this to happen, she has to give him access to her calendar data.
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